Klaas Annink was born on June 18, 1710, in Bentelo, which was part of the Dutch Republic at that time. He grew up in a region that would later become known as Twente in the Netherlands. Nicknamed “Huttenkloas,” which roughly translates to “Claes of the Huts”, Annink lived in the area around Hengevelde. He was married to Aarne Spanjers, and together they had a son named Jannes.

Klaas Annink, also known as Huttenkloas, was involved in many serious crimes in the 18th century. His activities took place mainly in Twente, Netherlands, and included both robbery and murder. He was often reported to work with his wife, Aarne Spanjers, and their son, Jannes.

In 1774, a merchant from Hanover looked into the disappearance of a family member. This investigation led to evidence that pointed to Annink's involvement in the murder. Because of this evidence, Annink was arrested. He spent 114 days in a specially-made chair during his detention.

The trial that followed was considered controversial by the standards of the time. While historical documentation is sparse by modern standards, it is understood that the evidence presented included both eyewitness testimonies and circumstantial links to other regional disappearances. Annink, his wife Aarne, and their son Jannes were all implicated in the crimes, though Klaas and Aarne bore the brunt of the charges. The son’s ultimate fate is less clearly recorded.

In 1775, Klaas Annink and Aarne Spanjers were found guilty of murder and robbery and were sentenced to death. They were executed on 13 September 1775.